The taxonomic status of Caligus polycanthi Gnanamuthu, 1950 is reconsidered based on materials collected from Canthidermis maculatus (Bloch) caught off the northeastern coast of Taiwan at 24°56.3'N 122°00.9'E. It is concluded that C. polycanthi is a valid species and C. sensilis Kabata and Gusev, 1966 is relegated to its synonym.